WO2019232775A1 - Dispositif de charge sans fil et terminal l'utilisant - Google Patents

Dispositif de charge sans fil et terminal l'utilisant Download PDF

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Publication number
WO2019232775A1
WO2019232775A1 PCT/CN2018/090374 CN2018090374W WO2019232775A1 WO 2019232775 A1 WO2019232775 A1 WO 2019232775A1 CN 2018090374 W CN2018090374 W CN 2018090374W WO 2019232775 A1 WO2019232775 A1 WO 2019232775A1
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WO
WIPO (PCT)
Prior art keywords
charging
battery
receiving
wireless charging
rectifier
Prior art date
Application number
PCT/CN2018/090374
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English (en)
Chinese (zh)
Inventor
刘其堂
刘策
舒为亮
刘彦丁
王平华
曹勇
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201880094401.4A priority Critical patent/CN112236923B/zh
Priority to EP18921931.4A priority patent/EP3796520A4/fr
Priority to PCT/CN2018/090374 priority patent/WO2019232775A1/fr
Priority to CN202311291139.1A priority patent/CN117293983A/zh
Publication of WO2019232775A1 publication Critical patent/WO2019232775A1/fr
Priority to US17/113,328 priority patent/US20210091599A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302—Overcharge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00309—Overheat or overtemperature protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/05—Circuit arrangements or systems for wireless supply or distribution of electric power using capacitive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage

Definitions

  • Embodiments of the present invention relate to the field of circuits, and more particularly, to a wireless charging device and a terminal using the device.
  • the power of wireless charging that is, the charging time or speed affects the wireless charging experience.
  • various wireless charging manufacturers can increase the power of wireless charging by increasing the input power or increasing the output voltage of the converter.
  • the wireless charging power of the prior art is basically below 10W, the charging time is longer, and the user experience is poor.
  • Iphone X uses a 2716mAh battery with a maximum of 7.5W wireless charging power, and the battery is fully charged for more than 200min. Because if you simply increase the wireless charging power, it will bring various safety issues, such as overheating, shortened battery life, battery damage and even explosion. Therefore, many manufacturers are still studying how to safely and effectively increase wireless charging power, but no significant research results have been found.
  • Embodiments of the present invention provide a wireless charging device and a terminal using the device, so as to improve the wireless charging speed while ensuring charging efficiency and safety.
  • an embodiment of the present invention provides a wireless charging device, which is located in an electronic device such as a terminal or an electric vehicle and is used to receive energy sent by a transmitting coil of a wireless charging transmitting end for charging a battery or a load such as a power-consuming component.
  • the wireless charging device includes a receiving coil, a switch selection circuit, M charging circuits, and a receiving end controller. An input end of the switch selection circuit is connected to an output end of the receiving coil.
  • the output terminal is connected to the input terminal of each of the M charging circuits; the charging power of the M charging circuits is different, and the output terminal of each of the M charging circuits is used For connecting a load of the electronic device; the receiving-end controller may obtain a coupling coefficient of the receiving coil and the transmitting coil, and control the switch selection circuit to select the M charging circuits according to the coupling coefficient N charging circuits are in conduction with the receiving coil, the M is an integer greater than or equal to 2, and the N is an integer greater than or equal to 1 and less than or equal to M .
  • the wireless charging device can accurately determine whether fast charging can be performed in real time according to the current coupling conditions of the transmitting and receiving coils, and can accurately and effectively configure the wireless charging device by selecting charging circuits with different powers.
  • the charging current or the load supply current so as to obtain higher wireless charging efficiency and support greater charging power; when the state of the wireless charging system changes, such as when the charging device moves during the charging process, the wireless charging system can be switched in time
  • the charging path ensures charging wireless transmission efficiency and uninterrupted transmission, thereby improving charging speed and ensuring charging efficiency and safety.
  • the load includes a battery
  • the receiver controller is specifically configured to control the switch selection circuit to select the M charging circuits according to the coupling coefficient and the obtained battery parameter.
  • N of the charging circuits are connected to the receiving coil
  • the battery parameter includes a battery level or a battery voltage.
  • different coupling coefficients used to reflect a coupling condition between the receiving coil and the transmitting coil may include a mutual inductance between the transmitting coil and the receiving coil or the wireless charging device.
  • the receiving end controller is specifically configured to determine the magnitude of the mutual inductance or the equivalent resistance and the Different battery parameters control the switch selection circuit to select N charging circuits among the M charging circuits to be conductive with the receiving coil.
  • the above-mentioned different coupling parameters require different charging parameters of the wireless charging system where the wireless charging device is located, and different coupling parameters may be selected to determine the coupling situation according to different situations, for example, the difficulty of obtaining each charging parameter.
  • the receiving controller is configured to, when the battery parameter is within a preset range, the receiving controller is specifically configured to be based on the mutual inductance or the equivalent
  • the real part of the impedance controls the switch selection circuit to select N charging circuits of different powers among the M charging circuits to conduct with the receiving coil, wherein the real part of the mutual inductance or the equivalent impedance is larger
  • the preset range of the battery parameter refers to the maximum capacity of the battery ([X% ⁇ Y%], X is greater than 2 and less than 5, so The Y is greater than 80 and less than 95
  • the battery parameter preset range refers to the [a% ⁇ b%] range of the rated voltage of the battery, where a is greater than 60 and less than 70, and b is greater than 90 and less than 98.
  • the electric quantity refers to the quantity of electricity when the battery is fully charged, and the rated voltage of the battery means
  • an embodiment of the present invention provides a terminal.
  • the terminal includes a wireless charging device and a load connected to the wireless charging device.
  • the load includes a battery and a power-consuming component.
  • the wireless charging device is configured to receive wireless signals. Charging the energy transmitted by the transmitting end for charging the battery or powering the power-consuming component, the wireless charging device includes a receiving coil, a switch selection circuit, M charging circuits, and a receiving end controller; the switch The input terminal of the selection circuit is connected to the output terminal of the receiving coil, and the output terminal of the switch selection circuit is connected to the input terminal of each of the M charging circuits; the charging power of the M charging circuits Different, the output end of each of the M charging circuits is used to connect the battery or other power-consuming components of the terminal;
  • the receiving-end controller is configured to obtain a coupling coefficient of the receiving coil and the transmitting coil, and according to the coupling coefficient, control the switch selection circuit to select the N charging circuits and the charging circuits among the M charging circuits.
  • the receiving coil is turned on, the M is an integer of 2 or more, and the N is an integer of 1 or more and M or less.
  • the terminalless can accurately and effectively configure the charging current of the wireless charging device or the power supply current of the load by selecting the charging circuit with different power according to the current coupling condition of the transmitting and receiving coils, thereby obtaining higher wireless charging.
  • Efficiency and when the state of the wireless charging system changes, such as when the terminal or the transmitting terminal moves during the charging process, the terminal can switch the charging path in time to ensure charging wireless transmission efficiency and uninterrupted transmission.
  • FIG. 1 is a diagram of a wireless charging system according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a wireless charging system in an embodiment of the present invention.
  • FIG. 3A is a schematic diagram of input voltage and current of a transmitting-end coil in an embodiment of the present invention.
  • 3B is a schematic diagram of a phase difference between an input voltage and a current of a transmitting-end coil in an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an output voltage of a receiving coil and an input current of a transmitting coil in an embodiment of the present invention.
  • FIG. 5 is a charging control flowchart of the wireless charging device in the embodiment of the present invention.
  • FIG. 6 is another charging control flowchart of the wireless charging device in the embodiment of the present invention.
  • FIG. 7 is a schematic circuit diagram of a wireless charging device according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • the wireless charging device in the embodiment of the present invention is mainly applicable to various electronic devices with wireless charging function, especially suitable for some portable devices, such as mobile phones, tablet computers, notebook computers, various wearable devices and other terminal products. Electric vehicles such as cars. For such terminal consumer products, there is a high requirement for mobility. Using wireless charging can completely break away from the constraints of cables, which will bring greater mobility and convenience, and significantly improve the user experience. and so
  • the wireless charging system involved in the embodiment of the present invention includes a transmitting end and a receiving end, wherein the transmitting end is a power adapter or a wireless charger or a wireless charging base, and the receiving end is integrated on an electronic device for receiving The energy from the transmitting end is used to charge the battery on the electronic device or directly power the electronic device.
  • the wireless charging device in the embodiment of the present invention It refers to the receiving end. It can be understood that the wireless charging device is not limited to charging. It can be understood as a device with a wireless power receiving function. The received electrical energy can be used for charging or directly used for power-consuming components. Loads other than batteries.
  • the wireless charging system in the embodiment of the present invention includes a transmitting end 2 and a terminal 1.
  • the terminal 1 serves as a receiving end, and a wireless charging device is integrated therein.
  • the wireless charging device is composed of a receiving end power circuit 10.
  • the transmitting end 2 includes a transmitting end power circuit 20 and a transmitting end controller 22.
  • the transmitting end 2 mainly includes a transmitting end power circuit 20 and a transmitting end controller 22.
  • the transmitting-end power circuit 20 includes a transmitting power conversion circuit 202 and a transmitting coil and a compensation circuit 201 for connecting to a power source 30.
  • the power source is generally a DC power source, such as an adapter.
  • the transmission power conversion circuit 202 is connected to the power source 30, and an output terminal thereof is connected to the transmission coil and the compensation circuit 201.
  • the power conversion circuit 202 is a one-stage conversion or a multi-stage conversion circuit for converting a DC voltage into a high-frequency AC voltage input to the transmitting coil and the compensation circuit 201.
  • the transmitting coil and compensation circuit 201 includes a compensation circuit section for adjusting the equivalent impedance of the latter stage of the power conversion circuit 202 and a transmitting coil for generating a high-frequency magnetic field and supplying energy to the receiving end.
  • the transmitting-end power circuit 20 further includes a coupling detection circuit connected in series between the power conversion circuit 202 and the transmitting coil and the compensation circuit 201.
  • the coupling detection is used to detect a coupling condition between a transmitting coil and a receiving coil to detect a coupling coefficient or mutual inductance or an impedance value or a coupling coefficient refracted by the receiving end to the transmitting end, and send a detection output signal to the Transmitter controller 22.
  • the transmitting-end controller 22 includes a detection part, a control part, and a communication part:
  • the detecting section is used for detecting a signal, for example, for detecting a current of a transmitting coil, an input voltage, an output voltage, and an output current of the power conversion circuit;
  • the control section is used to control the power conversion circuit to adjust the current or voltage such as the current of the transmitting coil, the output voltage of the rectifier at the receiving end, the receiving power at the receiving end, or the charging current at the receiving end;
  • the communication part is used to perform information interaction with the receiving end on related parameters such as control signals, detection signals, and mutual inductance of the coupling coefficient.
  • the wireless charging device is generally installed on the bottom of an electric vehicle or the terminal 1 near the rear cover, and receives the electromagnetic waves sent by the transmitting terminal 2 through the rear cover and generates induction on the receiving coil through the electromagnetic mutual inductance effect.
  • Current thereby charging the battery of the terminal 1 or supplying power to a power-consuming load in the terminal 1, which is an electronic component on the terminal 1, such as including a display screen, a processor, a sensor, and the like.
  • the wireless charging device includes a receiving-end power circuit 10 and a receiving-end controller 12 for connecting with a load 40.
  • the load 40 includes a power-consuming component of an electronic device or the load 40 includes a battery and a power-consuming component.
  • the power-consuming components include a battery, a display screen, a communication module, a circuit board, a processor, and the like.
  • the receiving-end power circuit 10 includes a receiving coil and a compensation circuit 101, a rectifier 102, a switch selection circuit 103, and M charging circuits 111 ... 11M, where M is an integer greater than or equal to two.
  • the receiving coil and the compensation circuit 101 include a receiving coil and a compensation circuit connected in series, wherein the receiving coil is used for electromagnetic induction in a high-frequency magnetic field to generate induced voltage and current, and plays a role of receiving energy;
  • the compensation circuit is used to adjust the impedance of the receiving coil so that the battery or other load of the terminal 1 can obtain the maximum received power.
  • the rectifier 102 includes an input terminal connected to the receiving coil and the compensation circuit 101 and an output terminal connected to the switch selection unit 103.
  • the rectifier is used to convert a high-frequency AC voltage generated by the receiving coil into a DC voltage.
  • the rectifier 102 may be a full-bridge rectifier or a class E rectifier.
  • An input terminal of the switch selection circuit 103 is connected to an output terminal of the rectifier 102, and an output terminal is respectively connected to the M charging circuits 111 ... 11M, and is used to select one of the charging circuits to charge the battery of the terminal 1.
  • the charging circuit includes only the first charging circuit 111 and the second charging circuit 112 with different charging powers, so as to meet the needs of more refined charging control to improve charging efficiency and safety while satisfying Some terminals have limited space requirements.
  • there are M charging circuits and the receiving-end controller 12 may control the switch selection circuit to select N charging circuits and M charging circuits among the M charging circuits according to the coupling coefficient.
  • the receiving coil is turned on, and N is an integer greater than or equal to 01 and less than or equal to M.
  • An input terminal of each of the M charging circuits is connected to an output terminal of the rectifier 102 through the switch circuit 103, and an output terminal of each charging circuit is connected to the load 40.
  • the receiving-end power circuit 10 further includes a coupling detection module 104.
  • the coupling detection module 104 is connected to the output of the receiving coil and the compensation circuit 101 and the input of the rectifier 102, and is configured to detect a charging parameter and send a detection output signal to the receiving controller 12 to Used to calculate a coupling parameter between the transmitting coil and the receiving coil.
  • the charging parameters refer to all voltage and current parameters related to charging efficiency or energy transmission.
  • the charging parameters include parameters such as the output current and voltage of the receiving coil and the compensation circuit 101. It can be understood that, when the transmitting terminal 2 is involved, the charging parameters also include parameters such as the input current and voltage of the transmitting coil and the compensation circuit 201.
  • the receiving end controller 12 is configured to receive charging parameters such as current or voltage of the transmitting end 2 or detect charging parameters such as current and voltage of the receiving coil.
  • the charging parameters include voltage and current parameters such as the receiving coil charging current, the input and output voltages of the rectifier 102, and the charging circuit output voltage and output current. It can be understood that, in some embodiments, the coupling detection module 104 is not on the receiving-end power circuit 10, but is integrated in the receiving-end controller 12, so that the receiving-end controller 12 has a detection The function of the charging parameter.
  • the receiving-end controller 12 calculates a coupling coefficient between the receiving coil and the transmitting coil according to the detected charging parameters, and selects different coupling parameters and battery parameters according to the coupling coefficient and battery parameters according to a mapping table and the like.
  • the receiving-end controller 12 includes a detection module, a policy selection module, a charging circuit selection module, a charging control module, a communication module, and other modules related to wireless charging control.
  • the battery parameter includes a battery level or a battery voltage.
  • the detection module detects the charging parameters of the wireless charging device, and determines a coupling parameter between a transmitting coil and a receiving coil;
  • the strategy selection module selects a charging strategy and a charging control parameter according to the coupling parameter
  • the charging circuit selection module selects a corresponding charging circuit according to the charging strategy, that is, selects a charging point corresponding to the charging power to charge the battery or power a load according to the charging power of each stage defined by the charging strategy;
  • the charging control module sends a current or voltage adjustment instruction to the transmitting terminal 2 through the communication module, so that the transmitting terminal can make corresponding adjustments according to the charging strategy, and can also pass the charging control.
  • the module is configured with a chip related to battery management, so that the wireless charging device can obtain the required charging power at different times and under different conditions.
  • the wireless charging device, method and terminal using the device according to the embodiments of the present invention detect the coupling between the receiving end and the transmitting end, adjust the corresponding charging mode or strategy according to the coupling status, and switch the corresponding charging mode according to the charging mode.
  • the charging circuit can not only guarantee the effect of fast charging, but also achieve the safety of ordinary charging.
  • the coupling between the transmitting coil and the receiving coil is determined by the coupling coefficient between the transmitting coil and the receiving coil.
  • the coupling coefficient is characterized by the mutual inductance of the transmitting coil and the receiving coil or the equivalent impedance reflected from the receiving end to the transmitting end, that is, the value of the coupling coefficient is obtained by calculating the magnitude of the mutual inductance or equivalent resistance. , And then determine the coupling situation.
  • the mutual inductance of the transmitting coil and the receiving coil, and the equivalent impedance reflected from the receiving end to the transmitting end cannot be directly measured and obtained, and can be obtained by calculating after collecting the voltage and current of the receiving or transmitting end.
  • the receiving end controller 12 needs to obtain the input voltage V in and the input current I in of the transmitting coil and the compensation circuit 201.
  • Related information such as phase difference and amplitude.
  • the receiving-end controller 12 may obtain the amplitudes of the input voltage V in and the input current I in of the transmitting coil and the compensation circuit 201 of the receiving end 2 through communication and interaction with the transmitting end 2. The phase difference between them and other related charging parameters.
  • the equivalent impedance reflected from the receiving end to the transmitting end Acos ( ⁇ ) / B, where ⁇ is the phase difference between the input voltage V in and the input current I in , and A is the amplitude of the input voltage V in , B is the magnitude of the input current I in .
  • the receiving-end controller 12 measures the peak or effective value of the output voltage of the receiving coil of the receiving end 10 and the compensation circuit 201, and obtains the output current of the transmitting coil of the transmitting end 2 and the compensation circuit 101. Peak or rms.
  • V 2 is the peak or effective value of the output voltage of the receiving coil of the receiving end 10 and the compensation circuit 101
  • I 1 is the peak or effective value of the output current of the transmitting coil of the transmitting end 10
  • V 2 is The positive sine wave, so the V 2 effective value is equal to the V 2 peak divided by the root 2 digits.
  • the charging strategy in the embodiment of the present invention refers to using different charging circuits and charging power to charge the battery in different situations.
  • the selection of different charging circuits and charging power in the charging strategy is mainly determined based on factors such as the coupling coefficient of the transmitting coil and the receiving coil, the amount of power of the battery, the charging circuit, and the temperature of the battery. For example, at a certain temperature threshold, the charging power and speed of the charging circuit are directly proportional to the coupling coefficient, and inversely proportional to the battery's charge, that is, the higher the coupling coefficient, the greater the power and the more it can support.
  • the receiving-end controller 12 controls the network based on the mutual inductance or the real part of the equivalent impedance.
  • the switch selection circuit selects N charging circuits of different powers among the M charging circuits to be conductive with the receiving coil, wherein the greater the real part of the mutual inductance or the equivalent impedance, the larger the real part of the mutual inductance or the receiving coil is selected.
  • the preset range of the battery parameter refers to the maximum capacity of the battery ([X% ⁇ Y%], where X is greater than 2 and less than 5, and Y is greater than 80 and less than 95.
  • the preset range of the battery parameter refers to the range of [a% ⁇ b%] of the rated voltage of the battery, where a is greater than 60 and less than 70 and b is greater than 90 and less than 98, and the maximum battery capacity is when the battery is fully charged.
  • Power the battery rated voltage refers to the corresponding voltage when the battery is fully charged.
  • the receiving-end controller 12 controls the control according to a positive correlation between the magnitude of the mutual inductance and the charging power of the M charging circuits.
  • the switch selection circuit selects N charging circuits among the M charging circuits to be conductive with the receiving coil; or
  • the preset range of the battery parameter refers to the range of the battery's maximum power [X% to Y%], or the preset range of the battery parameter refers to the [a% to b%] range of the rated voltage of the battery.
  • the positive correlation refers to a proportional relationship, that is, an independent variable increases, and a dependent variable also increases. The two variables change in the same direction. When one variable changes from large to small or small to large, the other variable also changes from large to small or small to large.
  • the independent variable can be understood as the coupling coefficient.
  • the variable can be understood as the charging power.
  • the positive correlation also includes a piecewise function relationship, that is, when the coupling coefficient continuously changes, the charging power is a discrete step change.
  • the coupling coefficient is determined by a1-a2-a3-
  • the corresponding charging power is b1 when the coupling coefficient is a1 to a2
  • the corresponding charging power is b2 when the coupling coefficient is a2 to a3
  • the corresponding charging power is when the coupling coefficient is a3 to a4.
  • the charging power is b3, the corresponding charging power is b4 when the coupling coefficient is a4 ⁇ a5, and so on, where a1 ⁇ a2 ⁇ a3 ⁇ a4 ⁇ a5, b1 ⁇ b2 ⁇ b3 ⁇ b4.
  • three charging modes are taken as an example. It can be understood that the embodiments of the present invention are not limited to the three charging modes, and more charging modes may be selected according to different situations.
  • the wireless charging step when controlling based on the mutual inductance between the transmitting coil and the receiving coil and the condition of the battery SOC, the wireless charging step is as follows:
  • the wireless charging system After the wireless charging system is connected to the charging or the receiving end is in the charging range and allowed to charge, the wireless charging system generally enters the normal charging mode first, that is, uses standard or lower power for ordinary wireless charging;
  • the coupling coefficient may be a mutual inductance ⁇ M between the transmitting coil and the receiving coil or an equivalent impedance reflected by the receiving end to the transmitting end, and the battery parameter.
  • the battery SOC mainly refers to battery capacity
  • the preset area is usually an area that has been pre-charged and is about to be fully charged. Different batteries and different environments may be slightly different.
  • the battery parameter is preset.
  • the range means that the battery power or the battery voltage is within the maximum ([X% ⁇ Y%] range, X is greater than 2 and less than 5, and Y is greater than 80 and less than 95.
  • the The preset area is 5% to 80%, that is, determining whether the battery SOC satisfies 5% ⁇ SOC ⁇ 80%;
  • the coupling coefficient is greater than a preset threshold.
  • the preset threshold is generally the minimum limit for achieving good coupling, for example, When the coupling coefficient is the mutual inductance ⁇ M between the transmitting coil and the receiving coil, determine whether the mutual inductance ⁇ M is greater than 30 ohm, that is, determine whether ⁇ M> 20 ohm is satisfied; if the result of S103 determination is that the battery SOC does not satisfy 5% ⁇ If the SOC is less than 80%, the normal charging mode is directly adopted;
  • the charging power of the first fast charging mode corresponding to the fast charging mode 1 is higher than the charging power of the second fast charging mode corresponding to the fast charging mode 2.
  • the wireless charging steps are as follows:
  • the wireless charging steps are as follows:
  • the wireless charging system After the wireless charging system is connected to the charging or the receiving end is in the charging range and is allowed to charge, it generally enters the normal charging mode first, that is, uses standard or lower power for ordinary wireless charging;
  • the preset area is usually an area that is pre-charged and is about to be fully charged. Different batteries and different environments may be slightly different.
  • the battery parameters The preset range refers to the range [a% ⁇ b%] of the battery rated voltage Vbat, where a is greater than 60 and less than 70, and b is greater than 90 and less than 98.
  • the preset area is 3.3 to 4.3, that is, determining whether the voltage Vbat of the battery satisfies 3.3 ⁇ Vbat ⁇ 4.3 volts;
  • the coupling coefficient is greater than a preset threshold, which is generally a minimum limit for achieving an excellent coupling degree. For example, when the coupling coefficient is the equivalent impedance R reflected by the receiving end to the transmitting end, determine whether R> 30ohm; if the result of the determination in S203 is that the voltage Vbat of the battery does not satisfy 3.3 ⁇ Vbat ⁇ 4.3V, Then directly use the ordinary charging mode;
  • a certain fast charging mode is selected. For example, if the voltage Vbat of the battery satisfies 3.3 ⁇ Vbat ⁇ 4.3 volts and R> 30ohm, the battery is charged using the fast charge mode 1, corresponding to the first fast charge mode;
  • the normal charging mode is selected for charging.
  • the wireless charging device may set the fast charging current range to 2.9-3.1A.
  • the receiving-end controller 12 detects the actual charging current of the battery and compares it with the actual charging current range:
  • the wireless controller is used to make the transmitting controller 22 reduce the output voltage of the DC / DC circuit by a step of 100mV, thereby reducing the transmitting current and finally reducing the actual charging after receiving the receiving terminal 1.
  • the wireless controller is used to make the transmitting-end controller 22 increase the output voltage of the DC / DC circuit by a step of 100mV, thereby increasing the transmitting current and finally increasing the actual charging current of the receiving terminal 1. ;
  • the wireless charging device continuously detects the real part of the impedance reflected by the receiving end to the transmitting end and the battery voltage to determine whether the charging mode needs to be changed.
  • the receiving end moves relative to the transmitting end during charging, at this time it is detected that the load on the receiving end reflects to the real part of the transmitting end impedance ⁇ 10ohm, then stop charging and alarm.
  • the moving position is not large, it meets the condition of 10ohm ⁇ the real end of the reflection from the receiving end to the transmitting end ⁇ 20ohm or the battery voltage is charged to 4.3V, then it will switch to the normal charging mode.
  • the controller S2 of the receiving end turns on, S1 turns off, and the ordinary charging circuit works.
  • the control target of the wireless charging device is changed to that the output voltage range of the rectifier 102 is 5-12V.
  • the receiving controller detects the output voltage of the rectifier and compares it with the target voltage range:
  • the wireless controller is used to make the transmitting-end controller 22 reduce the output voltage of the DC ⁇ DC circuit by a step of 100mV, thereby reducing the transmitting current and ultimately reducing the receiving
  • the terminal rectifier 102 actually outputs a voltage.
  • the transmitting power conversion circuit 202 of the transmitting terminal 2 includes a DC / AC circuit and the DC / DC circuit.
  • the wireless controller is used to make the transmitting controller increase the output voltage of the DC / DC circuit by a step of 100mV, thereby increasing the transmitting current and ultimately increasing the actual output of the receiving rectifier 102. Voltage.
  • the wireless charging control method used by the wireless charging device provided in this embodiment determines the coupling between the transmitting and receiving coils according to the current charging parameters of the wireless charging system, and can accurately determine whether fast charging can be performed in real time and is accurate and effective.
  • the wireless charging system configures the charging current; the fast charging circuit at the receiving end 1 in the wireless charging system uses a fixed ratio DC / DC converter, which has higher wireless charging efficiency and supports greater charging power; when the wireless charging system When the status changes, such as when the charging device moves during the charging process, the wireless charging system can switch the charging path in time to ensure that the charging is not interrupted.
  • the receiving-end power circuit 10 shown in FIG. 7 corresponds to several parts of the receiving end 1 in the wireless charging device shown in FIG. 2 described above, including the receiving-end controller 12 and the receiving-end power circuit 110.
  • FIG. 7 corresponds to the receiving end 1 in FIG. 2, but for convenience of description and clear display, FIG. 7 only shows two charging circuits of different powers including the charging circuit 111 and the charging circuit 11M, and there is no display portion. .
  • the switch selection unit 103 also displays only two switch diodes S1 and S2, but not all the switch diodes.
  • the switch diode may be any semiconductor tube or other component that implements a switch selection function, or any Circuit or component combination. It can be understood that the number of the switching diodes and the charging circuits shown in FIG. 7 cannot be used as a limitation of the embodiment of the present invention, and the embodiments of the present invention are not limited to the case where the number of the switching diodes and the charging circuit is only two, and can be applied reasonably In the case where the number is greater than two.
  • the receiving coil and compensation circuit 101 includes a receiving coil Lrx and a compensation capacitor Crx connected in series, wherein one end of the receiving coil Lrx and one end of the compensation capacitor Crx are connected to each other, and the other end of the receiving coil Lrx and The other ends of the compensation capacitor Crx are respectively connected to the compensation circuit Crx and two output ends of the receiving coil and the compensation circuit 101.
  • the rectifier 102 includes two diode bridge arms and a rectifier capacitor C1 connected in parallel. Each diode bridge arm and two ends of C1 of the rectifier capacitor are respectively connected to two output ends of the rectifier 102 respectively. Each diode bridge arm includes two diodes D connected in series. The two output ends of the receiving coil and the compensation circuit 101 are respectively connected to the intermediate points of the two bridge arms. The intermediate points refer to the points where two diodes D in each diode bridge arm are connected.
  • the switch selection circuit 103 includes two switches S1 and S2. One end of S1 and one end of S2 are connected to one output end of the rectifier 102, and the other end of S1 is connected to the charging circuit 11M. The other end of S2 is connected to the charging circuit 111.
  • the number of the charging circuits is M and the number of the switching tubes is also M, and the connection method of each charging circuit is similar to that of the S1 or S2, correspondingly controlling each switching tube and the receiving The coil is turned on and off.
  • the charging power of the charging circuit 111 is different from the charging circuit 11M.
  • the charging power of the charging circuit 111 is smaller than the charging power of the charging circuit 11M.
  • the charging circuit 111 is a normal charging circuit corresponding to a normal charging power
  • the charging point circuit 11M corresponds to a comparative charging circuit. Fast charging circuit with large charging power.
  • the first electrical circuit 111 includes two switching diodes Q5 and Q6, an inductor L, and two charging capacitors C2 and C3 connected in series.
  • One end of the two series-connected Q5 and Q6 is connected to one output end of the rectifier 102 through the S2, that is, one end of the two series-connected Q5 and Q6 is connected to the other end of the S2.
  • the other ends of two Q5 and Q6 connected in series with each other are connected to the other output end of the rectifier 102.
  • One end of the C2 is connected to the other end of the S2, and the other end of the C2 is connected to the other output end of the rectifier 102.
  • One end of the C3 is connected to the other output end of the rectifier 102, and the other end of the C3 is connected to the battery and a load.
  • One end of the inductor L is connected to a connection point between Q5 and Q6, and the connection point between Q5 and Q6 refers to a connection located between the Q5 and Q6 and connecting the Q5 and Q6 at the same time. The meanings of the connection points that appear later are similar, and are not repeated here for the sake of brevity.
  • the other end of the inductor L is connected to the other end of C3, and is also connected to the battery and the load.
  • the topology of the charging circuit 111 is a buck circuit and operates in a closed loop state. The input voltage can be converted into a voltage / current required by the battery for charging the battery according to a preset charging strategy.
  • the charging circuit 11M includes three charging capacitors C4, C5, and C6 and four switching diodes Q1, Q2, Q3, and Q4 connected in series.
  • the Q1-Q4 are connected in series in the order of Q1, Q2, Q3 to Q4.
  • One end of the bridge arm formed by the four Q1-Q4 connected in series is connected to an output end of the rectifier 102 through the S1, that is, one end of the bridge arm of the four Q1-Q4 connected in series is connected to the S1.
  • the other ends of the four Q1-Q4 bridge arms connected in series are connected to the other output end of the rectifier 102, and simultaneously connect the battery and the load.
  • One end of the C4 is connected to the other end of the S2, and the other end of the C4 is connected to the other output end of the rectifier 102.
  • One end of the C5 is connected to a connection point between Q1 and Q2, and the other end of the C5 is connected to a connection point between Q3 and Q4.
  • One end of C6 is connected to the connection between Q2 and Q3, one end of C6 is connected to the battery and one end of the load at the same time, one end of C6 is also connected to the other end of the inductor L and the The other end of C3 is connected at the same time.
  • the other end of the C6 is connected to the other end of the battery and the load, and the other end of the C6 is simultaneously connected to the other end of the C2 and the other output end of the rectifier 102.
  • the charging circuit is a switched capacitor circuit, in which the Q1 and Q3 and the Q2 and Q4 are turned on alternately to achieve a voltage conversion ratio of 2: 1.
  • the receiving-end controller 12 is configured to detect charging parameters such as an output voltage of the receiving coil and the compensation circuit 101, an output voltage of the rectifier 102, and input voltages of the battery and a load.
  • the receiving-end controller 12 is further configured to perform wireless communication with the transmitting terminal 2 to obtain control signals and charging parameters such as input voltage and current of the transmitting coil and the compensation circuit 201 from the transmitting terminal 2.
  • the coupling detection module 104 is integrated in the receiving-end controller 12 to detect the charging parameter of the receiving-end power circuit 10.
  • the wireless charging device of the present invention is used in a terminal 1, which includes a terminal back cover 5, the receiving-end power circuit 10, an electromagnetic shielding sheet 8, and a battery 9.
  • the receiving-end power circuit 10 is installed near the rear cover 5 of the terminal 1, and the receiving coil clamp of the receiving-end power circuit 10 is fixed between the rear cover 5 and the electromagnetic shielding sheet 8 through a mounting film 6,
  • the electromagnetic radiation on the receiving coil is also prevented by the electromagnetic shielding sheet 8 from affecting other power-consuming components of the terminal 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Cette invention concerne un dispositif de charge sans fil situé à l'intérieur d'un appareil électronique, tel qu'un terminal ou un véhicule électrique, et utilisé pour recevoir de l'énergie transmise par une bobine de transmission à une extrémité de transmission de charge sans fil, de manière à charger une batterie ou à fournir de l'énergie à une charge, telle qu'un composant consommant de l'énergie. Le dispositif de charge sans fil comprend une bobine de réception, un circuit de sélection à commutateur, de multiples circuits de charge et un dispositif de commande d'extrémité de réception. Une borne d'entrée du circuit de sélection à commutateur est reliée à une borne d'entrée de la bobine de réception, et une borne de sortie du circuit de sélection à commutateur est reliée à une borne de sortie de chacun des circuits de charge. Les circuits de charge ont des puissances de charge différentes, et chacun des circuits de charge a une borne de sortie pour connecter une charge de l'appareil électronique. Le dispositif de commande d'extrémité de réception est capable d'acquérir un coefficient de couplage de la bobine de réception et de la bobine de transmission, et de commander, en fonction du coefficient de couplage, le circuit de sélection à commutateur pour sélectionner un ou plusieurs des multiples circuits de charge à connecter électriquement à la bobine de réception.
PCT/CN2018/090374 2018-06-08 2018-06-08 Dispositif de charge sans fil et terminal l'utilisant WO2019232775A1 (fr)

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CN201880094401.4A CN112236923B (zh) 2018-06-08 2018-06-08 一种无线充电装置以及使用所述装置的终端
EP18921931.4A EP3796520A4 (fr) 2018-06-08 2018-06-08 Dispositif de charge sans fil et terminal l'utilisant
PCT/CN2018/090374 WO2019232775A1 (fr) 2018-06-08 2018-06-08 Dispositif de charge sans fil et terminal l'utilisant
CN202311291139.1A CN117293983A (zh) 2018-06-08 2018-06-08 一种无线充电装置以及使用所述装置的终端
US17/113,328 US20210091599A1 (en) 2018-06-08 2020-12-07 Wireless Charging Apparatus and Terminal Using Same

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PCT/CN2018/090374 WO2019232775A1 (fr) 2018-06-08 2018-06-08 Dispositif de charge sans fil et terminal l'utilisant

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EP3462564A4 (fr) * 2017-04-07 2019-05-08 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Système, appareil et procédé de charge sans fil, et dispositif à charger
EP3493361B1 (fr) 2017-04-07 2023-04-26 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Système, procédé de charge sans fil, et dispositif à charger
CN111030318B (zh) * 2019-12-31 2022-04-12 华为数字能源技术有限公司 无线电能传输系统
CN113067395B (zh) * 2019-12-31 2024-06-11 华为技术有限公司 电子设备、无线充电接收装置及控制方法、无线充电系统
WO2021134745A1 (fr) * 2020-01-02 2021-07-08 Texas Instruments Incorporated Seuil de mode d'économie d'énergie réglable pour convertisseur à découpage
CN113346599B (zh) * 2021-08-05 2021-11-02 江铃汽车股份有限公司 无线充电控制方法、装置、可读存储介质及充电设备
CN113612318B (zh) * 2021-08-05 2022-11-22 歌尔科技有限公司 一种无线充电装置及其无线充电底座和一种无线充电方法

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EP3796520A1 (fr) 2021-03-24
US20210091599A1 (en) 2021-03-25
CN112236923B (zh) 2024-03-26
EP3796520A4 (fr) 2021-05-05
CN117293983A (zh) 2023-12-26

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